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Handgun waiting periods are laws that impose a delay between the initiation of a purchase and final acquisition of a firearm. We show that waiting periods, which create a “cooling off” period among buyers, significantly reduce the incidence of gun violence. We estimate the impact of waiting periods on gun deaths, exploiting all changes to state-level policies in the Unites States since 1970. We find that waiting periods reduce gun homicides by roughly 17%. We provide further support for the causal impact of waiting periods on homicides by exploiting a natural experiment resulting from a federal law in 1994 that imposed a temporary waiting period on a subset of states.

How do teams working on complex projects get the help they need? Our qualitative investigation of the help provided to project teams at a prominent design firm revealed two distinct helping processes, both characterized by deep, sustained engagement that far exceeds the brief interactions described in the helping literature. Such deep help consisted of (1) guiding a team through a difficult juncture by working with its members in several prolonged, tightly clustered sessions or (2) path-clearing by helping a team address a persistent deficit via briefer, intermittent sessions throughout a project’s life. We present a model theorizing these processes, which has two noteworthy features. First, it emphasizes the socially constructed nature of helping behavior. That is, the parties must establish and maintain a helping frame for their interaction, especially when help-givers are high-status external leaders. Second, the model specifies that the rhythms of deep help—the duration and temporal patterns of giver-receiver interactions—are resource-allocation decisions that also contribute to the social meaning of help. These findings illuminate the theoretical and practical overlap between helping and external leadership in knowledge-intensive project work and the role of temporality in the helping process.